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Help needed with Commotion Motor Driver Shield

Hi

I am trying to drive 4 motors (pololu.com/product/1445/specs) with the Commotion Motor Driver (https://sites.google.com/site/daguproducts/system/app/pages/search?scope=search-site&q=commotion).

For starters I plugged in one motor, then used the code available here:

https://github.com/Blueglide/ComMotion

And was able to drive the motor two/three times, but could not do that any longer. I am not sure what changed.